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Diffstat (limited to 'libdb/db_gdbm.c')
| -rw-r--r-- | libdb/db_gdbm.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/libdb/db_gdbm.c b/libdb/db_gdbm.c new file mode 100644 index 0000000..99dbcfe --- /dev/null +++ b/libdb/db_gdbm.c @@ -0,0 +1,173 @@ +/* + * db_gdbm.c: low level gdbm interface routines for man. + * + * Copyright (C) 1994, 1995 Graeme W. Wilford. (Wilf.) + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + * Mon Aug 8 20:35:30 BST 1994 Wilf. (G.Wilford@ee.surrey.ac.uk) + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif /* HAVE_CONFIG_H */ + +#ifdef GDBM + +#include <stdbool.h> +#include <string.h> +#include <stdlib.h> +#include <stdio.h> +#include <setjmp.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> + +#include "stat-time.h" +#include "timespec.h" +#include "xalloc.h" + +#include "manconfig.h" + +#include "cleanup.h" +#include "debug.h" + +#include "db_xdbm.h" +#include "mydbm.h" + +/* setjmp/longjmp handling to defend against _gdbm_fatal exiting under our + * feet. Not thread-safe, but there is no plan for man-db to ever use + * threads. + */ +static jmp_buf open_env; +static bool opening; + +/* Mimic _gdbm_fatal's error output, but handle errors during open more + * gracefully than exiting. + */ +static void trap_error (const char *val) +{ + if (opening) { + debug ("gdbm error: %s\n", val); + longjmp (open_env, 1); + } else + fprintf (stderr, "gdbm fatal: %s\n", val); +} + +man_gdbm_wrapper man_gdbm_new (const char *name) +{ + man_gdbm_wrapper wrap; + + wrap = xmalloc (sizeof *wrap); + wrap->name = xstrdup (name); + wrap->file = NULL; + wrap->mtime = NULL; + + return wrap; +} + +bool man_gdbm_open_wrapper (man_gdbm_wrapper wrap, int flags) +{ + datum key, content; + + opening = true; + if (setjmp (open_env)) + return false; + wrap->file = gdbm_open (wrap->name, BLK_SIZE, flags, DBMODE, + trap_error); + if (!wrap->file) + return false; + + if ((flags & ~GDBM_FAST) != GDBM_NEWDB) { + /* While the setjmp/longjmp guard is in effect, make sure we + * can read from the database at all. + */ + memset (&key, 0, sizeof key); + MYDBM_SET (key, xstrdup (VER_KEY)); + content = MYDBM_FETCH (wrap, key); + MYDBM_FREE_DPTR (key); + MYDBM_FREE_DPTR (content); + } + + opening = false; + + return true; +} + +static datum unsorted_firstkey (man_gdbm_wrapper wrap) +{ + return gdbm_firstkey (wrap->file); +} + +static datum unsorted_nextkey (man_gdbm_wrapper wrap, datum key) +{ + return gdbm_nextkey (wrap->file, key); +} + +datum man_gdbm_firstkey (man_gdbm_wrapper wrap) +{ + return man_xdbm_firstkey (wrap, unsorted_firstkey, unsorted_nextkey); +} + +datum man_gdbm_nextkey (man_gdbm_wrapper wrap, datum key) +{ + return man_xdbm_nextkey (wrap, key); +} + +struct timespec man_gdbm_get_time (man_gdbm_wrapper wrap) +{ + struct stat st; + + if (!wrap->mtime) { + wrap->mtime = XMALLOC (struct timespec); + if (fstat (gdbm_fdesc (wrap->file), &st) < 0) { + wrap->mtime->tv_sec = -1; + wrap->mtime->tv_nsec = -1; + } else + *wrap->mtime = get_stat_mtime (&st); + } + + return *wrap->mtime; +} + +static void raw_close (man_gdbm_wrapper wrap) +{ + if (wrap->file) + gdbm_close (wrap->file); +} + +void man_gdbm_free (man_gdbm_wrapper wrap) +{ + man_xdbm_free (wrap, raw_close); +} + +#ifndef HAVE_GDBM_EXISTS + +int gdbm_exists (GDBM_FILE file, datum key) +{ + char *memory; + + memory = MYDBM_DPTR (gdbm_fetch (file, key)); + if (memory) { + free (memory); + return 1; + } + + return 0; +} + +#endif /* !HAVE_GDBM_EXISTS */ + +#endif /* GDBM */ |